Do you think these differences speak to socioeconomic status? For instance, do a higher proportion of low SES families opt for the baby names Sean and Lily — is that why these names aren’t as high as we’d expect on the passport list? (Families with less money to spare probably aren’t travelling internationally as often as other families.)

Most of the names popular in Ireland today — names like Jack, Sarah, Adam and Emma — are easy to pronounce. But others can be tricky for non-Irish-speakers to decipher. So, in honor of St. Patrick’s Day, here’s how to pronounce popular Irish names like Aoife, Cian, Niamh and Cillian.